[ncl-talk] problem with HDF file

[David Brown]

Geeta
The file test.h5 is on the ftp site. I put it there yesterday.  I am
assuming that is what you mean by
"Pls tell me when u upload the script for it's conversion to H5."
If not, please clarify that statement.
 -dave


On Thu, May 4, 2017 at 4:35 PM, Mary Haley <haley at ucar.edu> wrote:
> Geeta,
>
> I'm not clear on your question about extracting 2A25 reflectivity data
> depending on non-zero data of LIS. The text file I was looking at yesterday
> had no header information, so I have no idea what the various columns mean.
>
> Also, you attached two plots, but I'm not sure if you are trying to ask a
> specific question about them.
>
> I just plotted every lat/lon point that you had, which is what I assume is
> what you used to create the lightning marker plot. Is there something more
> you need to do with this particular plot?
>
> As for the contour plot with the labelbar, I'm assuming this is the
> reflectivity plot, but again, what is the "non-zero data of LIS"? Is LIS one
> of the columns of data in your ASCII file?
>
> You need to be more specific about what you need.
>
> --Mary
>
>
> On Wed, May 3, 2017 at 11:06 PM, Geeta Geeta <geetag54 at yahoo.com> wrote:
>>
>> Thanks Mary and Dave.
>> these files are not avaible in netcdf.  Mary's script is plotting it when
>> input file is txt.
>> I have to try that HDF4->HDF5 tool.
>>
>> Pls tell me when u upload the script for it's conversion to H5.
>>
>> I actually have to extract 2A25 reflectivity data depending on non-zero
>> data of LIS. I am attaching the Figures.
>>
>> I dont know how to do using the txt file.
>>
>> thanks
>>
>> Geeta.
>>
>>
>> On Thursday, 4 May 2017 12:22 AM, David Brown <dbrown at ucar.edu> wrote:
>>
>>
>> Hi Geeta,
>>
>> As Mary says, NCL does not currently support the Vdata type in HDF4,
>> but there is a tool called h4toh5 that you can download from the HDF
>> group site at https://ftp.hdfgroup.org/h4toh5/download.html. It was a
>> little hard to build on my Mac, but eventually I managed. (I would be
>> happy to fill you in on the details -- although you may be able to use
>> the binaries if you are working on Linux.)  It will convert HDF4 files
>> to HDF5. The Vdata type is converted to the HDF5 compound data type,
>> which NCL is able to interpret.I
>> I am attaching a print out of the output from ncl_filedump on the
>> converted test.h5 file. I will also upload test.h5 to the ftp site so
>> you can try it for yourself.
>> You should definitely use NCL 6.4.0 to work with this file. Also you
>> should read the "File I/O Improvements" section of the latest NCL
>> release notes
>> (http://www.ncl.ucar.edu/current_release.shtml#FileIOImprovements6.4.0)
>> for information on working with groups and compound data in NCL 6.4.0.
>> Hope this helps.
>> -dave
>>
>> On Wed, May 3, 2017 at 12:01 PM, Mary Haley <haley at ucar.edu> wrote:
>> > Geeta,
>> >
>> > This appears to be HDF4 VDATA data, which NCL doesn't currently support.
>> > We
>> > haven't received many requests for this, so it has been very low on our
>> > list
>> > of things to add support for.
>> >
>> > I added your email to the ticket we have on this (NCL-1195) in case this
>> > becomes something we need to support.
>> >
>> > Meanwhile, have you checked around to see if this data is available in
>> > NetCDF format instead?
>> >
>> > --Mary
>> >
>> >
>> >
>> >
>> > On Tue, May 2, 2017 at 5:59 PM, Geeta Geeta <geetag54 at yahoo.com> wrote:
>> >>
>> >> dear ncl users.
>> >> I have lighening data (orbital) which I wish to plot. the image
>> >> downloaded
>> >> from web is attached.
>> >> but when I doenload the datafile, from the following link.
>> >>
>> >>
>> >> https://lightning.nsstc.nasa.gov/lisib/lis1orbit.exe?which=qc&year=2011&day=104&orbit=76394
>> >>
>> >> aditya at agniilap:~/geeta/ncl/MYLIS$ ../bin/ncl trmm.lis.ncl
>> >>  Copyright (C) 1995-2014 - All Rights Reserved
>> >>  University Corporation for Atmospheric Research
>> >>  NCAR Command Language Version 6.2.1
>> >>  The use of this software is governed by a License Agreement.
>> >>  See http://www.ncl.ucar.edu/ for more details.
>> >>
>> >> Variable: hdf4_file
>> >> Type: file
>> >> File path: ./test.HDF
>> >> Number of global attributes: 0
>> >> Number of dimensions: 0
>> >> Number of variables: 0
>> >> warning:getfilevarnames: test contains no variables readable by NCL
>> >> (0) missing
>> >> I get this message.
>> >>
>> >> pls help me how to check the data file.
>> >>
>> >> Geeta.
>> >>
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